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11.
If radar has reportedly been detected on your WLAN deployment, what bands would you
consider avoiding?
- A.5 GHz UNII-1 and 2
- B.5 GHz UNII-2 and 3
- C.5 GHz UNII-2, 2e, and 3
- D.5 GHz UNII-2 and 2e
- E.5 GHz UNII-1, 2, and 3
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| IEEE 802.11h specifi ed the UNII-2 and 2e bands as DFS bands, which require mechanisms for avoiding radar. |
12.
In October 2004, the FCC ruled to allow for which of the following? (Choose all
that apply)
- A.100 mW EIRP for UNII-1
- B.External antenna option for UNII-2e
- C.Required permanently attached antenna for UNII-1
- D.External antenna option for UNII-1
- E.Allocating extended spectrum to 5 GHz UNII – UNII-2e
- Answer & Explanation
- Report
Answer : [D, E]
Explanation :
Explanation :
| The October 2004 FCC ruling removed restrictions for an integrated antenna for UNII-1 devices and allocated more spectrum for unlicensed use. Many other updates were also included in this update, such as encouraging the use of smart antennas and the use of MIMO. |
13.
Modulation can be defined as:
- A.The process of incorporating a chipping code to build resilience
- B.The process of encoding data symbols using a carrier frequency
- C.The process of modifying a carrier signal to represent data
- D.The process of representing data using RF coding techniques
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Modulation is the process of taking a carrier frequency and modifying it in a way that the receiver can decode data from the modifications to the carrier frequency. |
14.
HR/DSSS specifies the following PHY rates:
- A.1, 2
- B.1, 2, 5.5, 11
- C.6, 9, 12, 18, 24, 36, 48, 54
- D.MCS 1 – 15
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| HR/DSSS is the other name for the 802.11b specification and what the 802.11 standard refers to the technology in its documentation. |
15.
What power level in the United States might you not want to exceed if you survey for a 5
GHz deployment with a 3 dBi antenna that will use auto - channelization features?
- A.25 mW
- B.50 mW
- C.100 mW
- D.250 mW
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| UNII-1 is limited by the FCC to 50 mW EIRP (25 mW of transmit power with a 3 dBi antenna equals 50 mW EIRP). Even though UNII-2– 3 allows for higher EIRP, auto- channelization features of infrastructure devices would require cells using UNII-1 channels to not exceed 50 mW EIRP. If a survey was done at a higher transmit power, it might result in poor coverage at cell edges of APs configured for UNII-1 channels. |
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